JPH05294351A - Method for closing opening of moistureproofing paper bag - Google Patents

Abstract

PURPOSE:To close the opening of a moistureproofing paper bag in a manner wherein an inner layer tubular body can be taken out from an outer layer tubular body during or after the use of the bag contents, even if the opening part layers thereof are attached together in such a way that the bag opening parts can be opened by suction upon filling the bag with its contents. CONSTITUTION:In a bag body 14 comprising in combination an inner layer tubular body 11 consisting of a heat-sealable material and an outer layer tubular body 12 consisting of kraft paper, the bottom part thereof is bent back close to the center from a heat sealing part 15 and is enclosed with a contacting paper 17 with an opening tape 16. Moreover, in a moistureproofing paper bag 10 having the auxiliary flaps 19 and 20 with opening tapes 23 attached to the outer wall of the bag opening part, the end part including the attaching parts of the opening parts of the bag body 14 is slit after filling the bag with its contents, its lower parts are heat sealed, the opening parts are folded and the auxiliary flaps are attached together with hot melt to seal the bag.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for closing the mouth of a moisture-proof paper bag, and more particularly to a method for closing the mouth of a moisture-proof paper bag provided with an inner-layer tubular body made of a heat-sealable material and having straight end cuts. Regarding

[0002]

2. Description of the Related Art Conventionally, a moisture-proof paper bag is formed by forming a heat-sealable material into the innermost layer tubular body for heat-sealing the end portion of the innermost layer tubular body for directly containing the contents.
Alternatively, the innermost layer tubular body is formed of a processed paper having an inner surface laminated with a heat-sealable material, while the outer layer tubular body is formed with folding flaps at both ends.

Such a conventional moisture-proof paper bag is disclosed in, for example, Japanese Patent Publication No. 57-37500 and Japanese Utility Model Publication No. 59-298.
As disclosed in Japanese Patent Laid-Open No. 76-76, one end of the inner layer tubular body is heat-sealed, and a folding flap is bent and attached to a wall surface to seal the bottom closed portion.

By the way, in recent years, due to the problem of waste treatment, it is expected that it is necessary to consider the handling of the inner layer tubular body when discarding this type of paper bag. That is, as described above, since the heat-sealable inner layer tubular body may be a synthetic resin film or a processed paper laminated with a heat-sealable material, there is an environmental problem when it is incinerated. is there. Further, recently, there is a case where a processed paper in which aluminum foil is combined is used for the inner layer in order to improve the moisture proof property, and such an inner layer tubular body cannot be incinerated.

Therefore, when discarding this type of paper bag, the outer layer tubular body made of kraft paper is separated from the heat-sealable inner layer tubular body so that only the inner layer tubular body does not burn. It is desirable to treat it separately as garbage.
However, since the bottom part of the moisture-proof paper bag is bent toward the center of the heat-sealing part in the longitudinal direction and the folding flap is attached to the wall surface, the inner layer cylindrical shape is opened from the opening side after using the contents. Even if you try to pull the body out of the outer tubular body,
There is a problem that the inner layer tubular body is caught at the bottom closed portion and cannot be easily taken out.

Therefore, the present inventor bends the end portion of the closed portion which does not become the opening when the contents are taken out closer to the center of the bag main body in the longitudinal direction than the heat seal portion, and surrounds and fixes it with a patch paper with an opening tape or an auxiliary flap. I proposed the paper bag that I made earlier. According to this, when all the contents have been used up, the inner layer tubular body can be easily taken out from the mouth side with respect to the outer layer tubular body by tearing the backing paper at the bottom closing portion with an opening tape and returning the fold. You can

[0007]

However, it has become clear that such a paper bag has the following problems in closing the mouth portion for filling the contents. Generally, the filling of contents is mechanized, and when filling the contents, a method of pulling the outer wall surface of the mouth of the flat paper bag from both sides by suction to open the mouth has been used. However, the inner and outer layers of the mouth side of the paper bag must be adhered to this.

However, if the mouth layers of the paper bag are adhered to each other, even after the contents are used, even if the backing paper or the auxiliary flap at the closed end opposite to the opening side is torn and the fold of the end is returned. The inner layer tubular body cannot be taken out from the outer layer tubular body.

The object of the present invention is to solve the above-mentioned conventional problems. Even when the mouth layers are adhered so that the mouth can be opened by suction when filling the contents, Another object of the present invention is to provide a method for closing the mouth of a paper bag, which allows the inner layer tubular body to be taken out from the outer layer tubular body after use.

[0010]

DISCLOSURE OF THE INVENTION The present invention provides an end-layer straight-cutting inner-layer tubular body made of a material capable of heat-sealing and an end-line straight-cutting outer-layer tubular body made of at least one layer of kraft paper. The outer-layer tubular body is located outside the inner-layer tubular body, the edges of the two tubular bodies are aligned, and the end side which will be the content filling port in the future is bonded by interlayer bonding. The end of the bag body on the bottom side is heat-sealed, folded toward the center in the longitudinal direction from the heat-sealed portion, surrounded and fixed by a patch paper with a tape for opening, and the outer wall surface of the end on the mouth side of the bag body. In the method for closing the mouth of a paper bag, which comprises attaching at least one auxiliary flap with a tape for opening, which is coated with a hot-melt adhesive that is reactivated by heat, in the method for closing the auxiliary flap before or after filling the contents. Bending outside, before filling the contents The end of the bag body mouth portion including at least the interlayer glued portion is slit and removed, the lower portion thereof is heat-sealed, and then the auxiliary flap is returned, and the hot melt portion is reactivated by heat to be folded and sealed. And

[0011]

According to the method of closing the mouth portion of the moisture-proof paper bag of the present invention, both outer wall surfaces of the mouth portion of the moisture-proof paper bag are pulled by suction when filling the contents. Since the inner layer tubular body and the outer layer tubular body are adhered to each other at the mouth of the bag body, the inner layer tubular body is simultaneously pulled away by the wall portions of the inner layer tubular body due to the separation of the outer wall surface by suction. open. Then, the contents are filled from this mouth. The auxiliary flap with unsealing tape attached to the outer wall surface of the mouth of the bag body is bent outward before or after filling the contents, and the end of the bag body with the interlayer adhesive is slit and removed. Then
Heat seal the bottom. As a result, the mouth of the inner layer tubular body is closed, and the inner layer tubular body is free, that is, has no connection relation. After that, return the auxiliary flap, bend the end of the bag body together with the auxiliary flap at a position closer to the center of the bag body in the longitudinal direction than the position of the heat seal part, and use the hot-melt adhesive reactivated by heat to attach the auxiliary flap to the bag body. Adhere to the outer wall of the and seal it.

In the moisture-proof paper bag with the mouth closed in this way, when the contents are taken out, the auxiliary flap or patch paper at either the mouth or the bottom is torn by the opening tape and the end of the bag body is folded back. The end portion of the inner layer tubular body is cut from below the heat seal portion to take out the contents. After all the contents are used up, tear off the auxiliary flap or patch paper at the end that was at the bottom with the opening tape, fold back the end of the bag body, and pull out the inner layer tubular body from the outer layer tubular body. To take it out.

[0013]

EXAMPLES The method of closing the mouth of the moisture-proof paper bag according to the present invention will be described in more detail with reference to examples. FIG. 1 schematically shows a moisture-proof paper bag 10 for carrying out the mouth closing method of the present invention. The moisture-proof paper bag 10 includes a pleated end linear cut inner layer tubular body 11 made of a synthetic resin film such as a polyethylene film and a pleated end linear cut outer layer tubular body 12 made of kraft paper. The bag body 14 is constituted by a main body 14, and the end lines of the inner and outer layer tubular bodies 11 and 12 are aligned, and the end side which will be a content filling port in the future is subjected to interlayer adhesion (adhesive part is denoted by reference numeral 13). Shown) and combined.

The bottom side of the bag body 14 is heat-sealed with a film which is the inner layer tubular body 11 according to a conventional method. Then, one end side of the bag body 14 is heat-sealed to the inner layer tubular body 11. Fold the sheet 15 closer to the center in the longitudinal direction, and apply the folded end to the patch paper 1 with the unsealing tape 16.
It is surrounded and fixed by 7, and is a bottom closing portion 18.

On the other hand, on one outer wall surface on the mouth side of the bag body 14, two auxiliary flaps 19 having the same width as the outer wall surface,
One ends 19a and 20a of the 20 are fixed by an adhesive 21. The inner auxiliary flap 19a has a length such that the other end 19b is substantially aligned with the mouth edge of the bag body 14, and the outer auxiliary flap 20 has the other end 20b outside the other end 19b of the auxiliary flap 19. It has a length that projects toward you.

One end 20a of the outer auxiliary flap 20
It is preferable from the standpoint of strength that not only is the adhesive adhered to the outer surface of the inner auxiliary flap 19, but also the end surface of the auxiliary flap 19 is directly opposed to the outer wall surface of the bag body 14 and the outer wall surface. .. An unsealing tape 23 is attached to the inner surface of the inner auxiliary flap 19 of the two-layered auxiliary flaps 19 and 20 at a position slightly above a bending position 22 of the mouth of the bag body 14 described later.

As described above, the other ends of the two auxiliary flaps 19 and 20 attached to the outer wall surface of the mouth of the bag body 14 have a substantially stepped shape, and the hot melt which is reactivated by heat is formed on the stepped surface. The system adhesive 24 is applied.

Next, the moisture-proof paper bag 10 constructed as described above.
A method for filling the contents with and closing the mouth will be described. When filling the moisture-proof paper bag 10 with contents, the moisture-proof paper bag 10 is set in a machine called a top sealer, and the outer wall surfaces of both flat mouths of the moisture-proof paper bag 10 are pulled by suction by this machine. At the mouth of the moisture-proof paper bag 10, the outer layer tubular body 12 and the inner layer tubular body 11 are connected by the adhesive portion 13, so that the inner layer tubular body 1 can be pulled by pulling both outer wall surfaces.
The mouth of 1 opens. Then, the contents are filled from this mouth portion.

When the contents are filled, the auxiliary flaps 19 and 20 are bent outward as shown in FIG.
The folding of the auxiliary flaps 19 and 20 is performed by the moisture-proof paper bag 10.
It may already be folded during the manufacture of the, but rather the mouth closing operation may be simplified. After that, the bag body 1
The end on the mouth side of 4 is slit (cut off) at a position 25 below the interlayer adhesive 13, that is, near the center of the bag body. As a result, the bag body 14 becomes the inner / outer layer tubular body 1 at the mouth.
The connection relationship between 1 and 12 is lost, and the inner layer tubular body 11 is completely free from the outer layer tubular body 12.

Then, as shown in FIG. 3, the mouth end of the bag body 14 is sandwiched from both outer wall sides by a heating bar to heat seal the inner tubular body 11. This heat seal part is designated by reference numeral 2.
Shown by 6. Next, the auxiliary flap 1 that has been bent
Put back 9 and 20 (Fig. 4). As a result, the auxiliary flaps 19, 20 to which the hot melt adhesive 27 is applied
The other ends 19b and 20b of the above protrude outwardly from the mouth end of the bag body 14 and are substantially stepped surfaces including the end of the bag body 14.

After that, the hot melt adhesive 24 on the inner surfaces of the other ends of the auxiliary flaps 19 and 20 projecting from the mouth of the bag body 14 is reactivated by heat, and the mouth of the moisture-proof paper bag 10 is sealed from the heat seal portion 26 to the bag body. It is bent at a position near the center, and the auxiliary flaps 19 and 20 are adhered to the outer wall surface of the bag body 14 to be closed (FIG. 5). At this time, the structure of the mouth closing portion is substantially the same as the bottom closing portion 18 of the moisture-proof paper bag 10 shown in FIG.

When the contents are taken out from the moisture-proof paper bag 10, the opening tape 23 or 16 at either the mouth closing portion or the bottom closing portion 18 is pulled up to tear the auxiliary flaps 19, 20 or the patch paper, and Return the end bent portion of the bag body 14 to open the mouth of the outer layer tubular body 12,
The inner layer tubular body 11 is cut and opened at a position closer to the center in the longitudinal direction than the heat seal portion 26 or 15. When the moisture-proof paper bag 10 has been emptied using all the contents, the other end closure is opened in exactly the same way as the one closure previously described. As a result, the relative engagement relationship between the inner layer tubular body 11 and the outer layer tubular body 12 disappears, and the inner layer tubular body 11
The two are easily separated by pulling out from the outer layer tubular body 12.

When the one end closed portion is opened when the contents are used, the other end closed portion is also opened at the same time as shown in FIG. 6, so that the inner layer tubular shape containing the contents remains. The body 11 may be extracted from the outer tubular body 12 and used.

[0024]

As described above, according to the method of closing the mouth portion of the moisture-proof paper bag of the present invention, the automatic machine for closing the mouth portion of the pinch bag called the top sealer, which the user has conventionally, is slightly improved. After using the contents, the inner layer tubular body 11
Can be used to close the mouth of the moisture-proof paper bag 10 that can be easily pulled out from the outer layer tubular body 12, and the work of closing the mouth of the moisture-proof paper bag, which is easy to dispose of, is significantly facilitated.

[Brief description of drawings]

FIG. 1 is a structural explanatory view schematically showing a moisture-proof paper bag for carrying out the method for closing the mouth of the present invention.

FIG. 2 is a structural explanatory view schematically showing the mouth portion of the moisture-proof paper bag showing one process of the mouth-portion closing step of the moisture-proof paper bag shown in FIG.

FIG. 3 is a configuration explanatory view schematically showing a mouth portion of the moisture-proof paper bag showing one process of a mouth-closing step of the moisture-proof paper bag shown in FIG.

FIG. 4 is a structural explanatory view schematically showing the mouth portion of the moisture-proof paper bag showing one process of the mouth-portion closing step of the moisture-proof paper bag shown in FIG.

FIG. 5 is a structural explanatory view schematically showing a mouth closing portion of the closed moisture-proof paper bag.

FIG. 6 is a structural explanatory view showing an example of opening when using the contents in a moisture-proof paper bag whose both ends are closed.

[Explanation of symbols]

 10 Moisture-Proof Paper Bag 11 Inner Layer Cylindrical Body 12 Outer Layer Cylindrical Body 13 Interlayer Adhesive Section 14 Bag Body 15 Heat Seal Section 16 Opening Tape 17 Backing Paper 18 Bottom Closing Section 19 Auxiliary Flap 20 Auxiliary Flap 22 Bending Position 23 Opening Tape 24 Hot Melt System Adhesive 25 Slit position 26 Heat seal part

Claims (1)

[Claims] 1. An inner-layer tubular body made of a heat-sealable material and having an end straight line cut, and an end linearly cut outer layer tubular body made of at least one layer of kraft paper, wherein the outer layer tubular body is the inner layer. Located on the outer side of the tubular body and aligning the edges of both the tubular bodies on a line, the bottom side of the bag main body which is assembled by interlayer-adhering the end side which will be the content filling mouth in the future The end portion is heat-sealed, the end portion is bent toward the center in the longitudinal direction from the heat-sealed portion, and fixed by surrounding with a patch paper with a tape for opening, and the outer wall surface of the end portion on the mouth side of the bag body is reactivated by heat. A method for closing the mouth of a paper bag, which comprises applying at least one auxiliary flap with a tape for unsealing to which a melt adhesive is applied, in which the auxiliary flap is bent to the outside before or after filling the contents, and after filling the contents. Less at the mouth of the bag body The end including the glued part between the layers is removed by slitting, the lower part is heat-sealed, and then the auxiliary flap is returned to reactivate the hot-melt part by heat to fold and seal the bag. Mouth closure method.